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Head-body 50-65; tail 30-36 cm; weight 2-5 kg.
This semi-aquatic dark carnivore is otter-like in general appearance, though it has broader snout and smaller shorter tail. Body dark brown, finely grizzled by lighter spots; belly paler brown. Head broad and flat; thick lips adorned by very long whiskers. Its first three upper premolars unusually large with high, compressed and pointed crown, remaining cheek teeth broad. Ears small, rounded and well-separated. Feet partially webbed.